Sight glass for sprinkler system lines



FIG. 1 is a left front perspective view of an embodiment of a sight glass for sprinkler system lines showing my new design;

FIG. 2 is a front view thereof, the opposite side being the mirror image thereof;

FIG. 3 is a left end view thereof;

FIG. 4 is a right end view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a left front perspective view of a second embodiment of the design;

FIG. 7 is a front view thereof, the opposite side being the mirror image thereof;

FIG. 8 is an left end view thereof;

FIG. 9 is a right end view thereof; and,

FIG. 10 is a bottom view thereof. 

The ornamental design for sight glass for sprinkler system lines, as shown and described. 